Azaphilones from the Endophyte Diaporthe sp. and Their Toxicity

Area of Science:

• Natural Product Chemistry
• Pharmacology
• Toxicology

Background:

• Conventional cancer therapies like chemotherapy and targeted treatments often cause severe side effects.
• There is a critical need for developing anticancer agents with improved safety profiles.
• Exploring natural products from endophytic fungi offers a promising avenue for discovering new chemotherapeutic leads.

Purpose of the Study:

• To isolate and characterize novel azaphilone derivatives from the endophyte of Anoectochilus roxburghii.
• To evaluate the in vivo toxicity of these isolated compounds using a zebrafish model.
• To assess the potential of these compounds as safe anticancer drug leads.

Main Methods:

• Isolation and structural elucidation of three azaphilone derivatives (chaetoviridin A, chaetoviridin E, and chaetomugilin D) using Nuclear Magnetic Resonance (NMR) spectroscopy.
• In vivo toxicity assessment of the isolated compounds in a zebrafish model.
• Comparative analysis of the origin of isolated azaphilones, noting their first-time isolation from Diaporthe species.

Main Results:

• Three azaphilone derivatives, chaetoviridin A (1), chaetoviridin E (2), and chaetomugilin D (3), were successfully isolated and their structures determined.
• The evaluated azaphilone derivatives exhibited no observable toxicity in the zebrafish model.
• These compounds represent the first reported isolation of these specific azaphilones from the Diaporthe genus.

Conclusions:

• The isolated azaphilone derivatives demonstrate a favorable safety profile, as indicated by the lack of toxicity in zebrafish.
• These compounds hold potential as safe anticancer drug leads, warranting further investigation for their therapeutic efficacy.
• The discovery expands the known natural product repertoire of Diaporthe species and offers new candidates for anticancer drug development.